The Colorado State University Plant Diagnostic Clinic blog serves as an information resource on disease and insect problems or questions that we see in the clinic or get asked frequently.

Tuesday, August 3, 2010

Wheat Virus Survey Results

Since wheat harvest is now finished and we are headed into corn season, I thought I would share the general results of the wheat virus survey. In this survey we test for five known wheat-infecting viruses, Cereal Yellow Dwarf Virus (CYDV, formerly known as BYDV-rpv), Barley Yellow Dwarf Virus (BYDV-pav), High Plains Virus (HPV), Wheat Streak Mosaic Virus (WSMV), and Triticum Mosaic Virus (TriMV). A total of 368 ELISA's (enzyme-linked immunosorbent assay) were performed in the diagnostic clinic. Of all the ELISA's run, 252 of these were for the wheat breeding program. There were a total of 116 wheat samples sent in to the clinic from growers, extension agents and crop consultants. The results of those 116 samples were 79 virus positive and 37 virus negative. The results reported here are the compilation of the 79 virus positive wheat samples from growers and do not include the results of the wheat breeding program.

39 samples had single virus infections; the sample was positive for only one of the five viruses tested.

CYDV (3 positives)

BYDV-pav (13 positives)

HPV (6 positives)

WSMV (14 positives)

TriMV (3 positives)

40 samples had co-infections; meaning the sample was positive for two or more of the viruses tested.

32 samples were co-infected with 2 viruses

7 samples were co-infected with 3 viruses

one sample was co-infected with 4 viruses

there were no samples that tested positive for all five viruses

Of the 32 samples that were positive for two viruses, 17 of those samples were positive for WSMV and TriMV.

Overall, WSMV is still the number one wheat virus in our state, either singly or co-infected with other viruses.